20 October 2004 White LED performance
Author Affiliations +
Two life tests were conducted to compare the effects of drive current and ambient temperature on the degradation rate of 5 mm and high-flux white LEDs. Tests of 5 mm white LED arrays showed that junction temperature increases produced by drive current had a greater effect on the rate of light output degradation than junction temperature increases from ambient heat. A preliminary test of high-flux white LEDs showed the opposite effect, with junction temperature increases from ambient heat leading to a faster depreciation. However, a second life test is necessary to verify this finding. The dissimilarity in temperature effect among 5 mm and high-flux LEDs is likely caused by packaging differences between the two device types.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yimin Gu, Nadarajah Narendran, Jean Paul Freyssinier, "White LED performance", Proc. SPIE 5530, Fourth International Conference on Solid State Lighting, (20 October 2004); doi: 10.1117/12.567677; https://doi.org/10.1117/12.567677


The heat dissipation performance of LED applied a MHP
Proceedings of SPIE (September 14 2005)
Evaluating the junction temperature of AC LEDs by DC and...
Proceedings of SPIE (September 23 2011)
Thermal analysis of multichip LED packages
Proceedings of SPIE (September 21 2006)
Thermal analysis and design of high power LED packages and...
Proceedings of SPIE (September 12 2006)
Estimating the junction temperature of AC LEDs
Proceedings of SPIE (August 18 2010)

Back to Top